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ReturnBookDao.java
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ReturnBookDao.java
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import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class ReturnBookDao {
public static int delete(String bookcallno,int studentid){
int status=0;
try{
Connection con=DB.getConnection();
status=updatebook(bookcallno);//updating quantity and issue
if(status>0){
PreparedStatement ps=con.prepareStatement("delete from issuebooks where bookcallno=? and studentid=?");
ps.setString(1,bookcallno);
ps.setInt(2,studentid);
status=ps.executeUpdate();
}
con.close();
}catch(Exception e){System.out.println(e);}
return status;
}
public static int updatebook(String bookcallno){
int status=0;
int quantity=0,issued=0;
try{
Connection con=DB.getConnection();
PreparedStatement ps=con.prepareStatement("select quantity,issued from books where callno=?");
ps.setString(1,bookcallno);
ResultSet rs=ps.executeQuery();
if(rs.next()){
quantity=rs.getInt("quantity");
issued=rs.getInt("issued");
}
if(issued>0){
PreparedStatement ps2=con.prepareStatement("update books set quantity=?,issued=? where callno=?");
ps2.setInt(1,quantity+1);
ps2.setInt(2,issued-1);
ps2.setString(3,bookcallno);
status=ps2.executeUpdate();
}
con.close();
}catch(Exception e){System.out.println(e);}
return status;
}
}